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Jupiter (clearer) Nov 5th 2023 w/Mewlon 180c

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Why are diopters extra....

Started by jke47348, 09/06/2004 06:15PM
Posted 09/06/2004 06:15PM Opening Post
OK, this is probably a silly question, but why are diopters extra? It would seem to me that it wouldn't be too hard to thread either one or the other EP holders on a pair of BV's to accept a helical focuser.

Instead you have to pay extra for (not just one) two diopter adjusters. The only BV's I've seen on the market with built in helical focusers are the Binomates and BO's new Binoviewer.

Not sure what the percentages are, but I do know that many people wear glasses. And even regular binoculars have at least one EP (usually the left) that has separate focussing adjustments. So why not BV's?

Clear skies!
JK Edwards

Clear Skies,
Joe

Nexstar 8i
6" f/8 Dob
Orion ST80
Binos: 7x35, 10x50, 11x70
Posted 09/06/2004 09:25PM #1
The diopter adjustment is handy on the Binomate. I find it necessary to tweak the focusing differences slightly with different pairs of eyepieces, and there's also a slight difference between the acuity in my two eyes, also. It's essential to me, just as it is on binoculars, but I'm very picky about sharpness.

-- Tom